Family board: tap chores to take, finish or undo them; style number inputs

- Chores on the board are tappable; pick your name (PIN unless a child) and it happens as you
- Up-for-grabs chores offer "I did it" or "Take it for later"
- Number inputs (chore points, time limit) use the dark input style so they are readable
- Tests and README updated

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/board.html

@@ -65,6 +65,7 @@
   #ov { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: grid; place-items: center; padding: 18px; } #ov[hidden] { display: none; }
   #ovb { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 20px; width: 100%; max-width: 380px; text-align: center; }
   .err { color: var(--danger); min-height: 20px; }
+  .chrow { width: 100%; background: none; border: 0; border-bottom: 1px solid var(--line); color: var(--text); font: inherit; font-size: 17px; text-align: left; cursor: pointer; } .chrow .chk { width: 24px; height: 24px; border: 2px solid var(--line); border-radius: 7px; display: grid; place-items: center; flex: none; font-size: 15px; } .chrow.dn .chk { background: var(--accent); border-color: var(--accent); color: #fff; } .chrow.dn .g { text-decoration: line-through; opacity: .6; }
 </style>
 </head>
 <body>